Smart Hearth Rate Belt 2 XS/S

Trust Every Beat

An ECG front end identifies and rejects the artifacts that distort a heart rate reading, so the trace follows your effort through intervals, surges and long steady work. A new chest-strap construction shields the signal from static noise, holding readings stable from the first minute. High-resolution beat-to-beat R-R data is also what makes real-time ZoneSense possible on a compatible Suunto watch.

Wear It and Forget It

A 13 g transmitter, 36.5 × 36.5 × 8.5 mm, sits low and flat against the chest. The soft strap and silicone grip hold their position through surges and descents, so the belt stays where you set it and your attention stays on the session. Around 460 hours of battery life from a single CR2032 cell keeps maintenance rare.

See How You Actually Run

Paired with a compatible Suunto watch, a six-axis motion sensor measures cadence, ground contact time, vertical oscillation, flight time and left/right ground contact balance, so you can see how your form holds as speed rises and fatigue sets in. Up to 20 hours of rolling R-R memory sits on the belt itself, and your watch reads it back by timestamp to complete the record after reconnecting.

One Belt, Three Screens

Connect to as many as three devices at once over Bluetooth. A watch records the session, a bike computer shows live heart rate, and your phone runs the app alongside both. Every device receives the same live data, so a long ride or a triathlon brick runs start to finish on a single pairing.

TECHNICAL SPECIFICATIONS

GENERAL

Removable Sensor Module

Replaceable Chest Strap

Weight:

Smart Module: 12.8 g,

XS/S Chest Strap: 37.4 g,

M/L Chest Strap: 41.3 g

Smart Module Dimensions: 36.5mm x 36.5mm x 8.5mm

Chest Size Range: XS/S: 66-102 cm, M/L: 74-125 cm

Material: Smart Module: Stainless steel cover plate + fiber reinforced composite material,

Chest Strap: Polyamide/elastane on polyurethane contact surfaces

PHYSICAL SPECIFICATIONS

Operating temperature: 0℃~ +55℃

Storage temperature: -20° C to +55° C / -5° F to +130° F

Operating Relative Humidity: 45~85%RH

BATTERY LIFE

Easy Battery Replacement

Battery: CR2032

Standby Time: 3 years

Working Hours: 460h

Current:

Shutdown Current: ＜10uA

Operating Current: ＜10 mA

Voltage

Alarm Voltage: 2.7V

Power-Off Voltage: 2.6V

Rated Voltage: 3.0V

CONNECTIVITY

Bluetooth: User controlled acceptance of who can connect. Connection is encrypted.

Supported concurrent Bluetooth connections: 3

Bluetooth Version: V5.4

Bluetooth Chip Type/Model: nRF54L15-QFAA

Bluetooth Transmission Frequency: 2.402～2.480 GHz

Bluetooth Transmission Power: ＜0dBm(-6dBm)

Bluetooth Transmission Range (In Open Space Without Obstacles): >10 meters

TRAINING FUNCTIONS

HEART RATE

Heart Rate Measurement

Heart Rate Variability Measurement

Memory function: Yes for the Heart rate variability and heart rate. The memory is only compatible with Suunto Watches. The memory is 20 hours long with a heart rate of 180 BPM

SPORT EXPERTISE

RUNNING

Running Form measurement